Abstract

The interaction of the 1-st (FF) and 2-nd (SH) harmonics of light in Bragg gratings with a quadratic nonlinearity can support parametric gap solitons.^1-4 Some of basic properties of slow and immobile gap solitons have already been reported.^1-3 The study of gap soliton trapping and interaction was begun recently.^3–4 For practical applications, such as all-optical data storage and processing, it is very important to understand the dynamics of self-trapping and interactions between such solitons. Here we discuss numerical simulations of nonlinear tunneling of optically coupled FF and SH in quadratically nonlinear gratings, showing a possibility of slow soliton excitation by long CW input beams and outline important scenarios of gap soliton collisions. Also, we introduce a simple sufficient criterion of self-trapping.

© 1999 Optical Society of America